1 /* General Solaris system support.
2 Copyright (C) 2004-2015 Free Software Foundation, Inc.
3 Contributed by CodeSourcery, LLC.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
28 #include "stringpool.h"
35 #include "diagnostic-core.h"
37 tree solaris_pending_aligns, solaris_pending_inits, solaris_pending_finis;
39 /* Attach any pending attributes for DECL to the list in *ATTRIBUTES.
40 Pending attributes come from #pragma or _Pragma, so this code is
41 only useful in the C family front ends, but it is included in
42 all languages to avoid changing the target machine initializer
43 depending on the language. */
46 solaris_insert_attributes (tree decl, tree *attributes)
50 if (solaris_pending_aligns != NULL && TREE_CODE (decl) == VAR_DECL)
51 for (x = &solaris_pending_aligns; *x; x = &TREE_CHAIN (*x))
53 tree name = TREE_PURPOSE (*x);
54 tree value = TREE_VALUE (*x);
55 if (DECL_NAME (decl) == name)
57 if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl))
58 || lookup_attribute ("aligned", *attributes))
59 warning (0, "ignoring %<#pragma align%> for explicitly "
60 "aligned %q+D", decl);
62 *attributes = tree_cons (get_identifier ("aligned"), value,
64 next = TREE_CHAIN (*x);
71 if (solaris_pending_inits != NULL && TREE_CODE (decl) == FUNCTION_DECL)
72 for (x = &solaris_pending_inits; *x; x = &TREE_CHAIN (*x))
74 tree name = TREE_PURPOSE (*x);
75 if (DECL_NAME (decl) == name)
77 *attributes = tree_cons (get_identifier ("init"), NULL,
80 DECL_PRESERVE_P (decl) = 1;
81 next = TREE_CHAIN (*x);
88 if (solaris_pending_finis != NULL && TREE_CODE (decl) == FUNCTION_DECL)
89 for (x = &solaris_pending_finis; *x; x = &TREE_CHAIN (*x))
91 tree name = TREE_PURPOSE (*x);
92 if (DECL_NAME (decl) == name)
94 *attributes = tree_cons (get_identifier ("fini"), NULL,
97 DECL_PRESERVE_P (decl) = 1;
98 next = TREE_CHAIN (*x);
106 /* Output initializer or finalizer entries for DECL to FILE. */
109 solaris_output_init_fini (FILE *file, tree decl)
111 if (lookup_attribute ("init", DECL_ATTRIBUTES (decl)))
113 fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".init");
114 ASM_OUTPUT_CALL (file, decl);
115 fprintf (file, "\t.popsection\n");
118 if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl)))
120 fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".fini");
121 ASM_OUTPUT_CALL (file, decl);
122 fprintf (file, "\t.popsection\n");
126 /* Emit an assembler directive to set symbol for DECL visibility to
127 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
130 solaris_assemble_visibility (tree decl, int vis ATTRIBUTE_UNUSED)
132 #ifdef HAVE_GAS_HIDDEN
133 /* Sun as uses .symbolic for STV_PROTECTED. STV_INTERNAL is marked as
134 `currently reserved', but the linker treats it like STV_HIDDEN. Sun
135 Studio 12.1 cc emits .hidden instead.
137 There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED,
138 STV_SINGLETON, and STV_ELIMINATE.
140 See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining
141 Additional Symbols, and Ch. 7, Object-File Format, Symbol Table
144 static const char * const visibility_types[] = {
145 NULL, "symbolic", "hidden", "hidden"
148 const char *name, *type;
150 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
151 type = visibility_types[vis];
153 fprintf (asm_out_file, "\t.%s\t", type);
154 assemble_name (asm_out_file, name);
155 fprintf (asm_out_file, "\n");
157 if (!DECL_ARTIFICIAL (decl))
158 warning (OPT_Wattributes, "visibility attribute not supported "
159 "in this configuration; ignored");
163 /* Group section information entry stored in solaris_comdat_htab. */
165 typedef struct comdat_entry
173 /* Helpers for maintaining solaris_comdat_htab. */
175 struct comdat_entry_hasher : typed_noop_remove <comdat_entry>
177 typedef comdat_entry *value_type;
178 typedef comdat_entry *compare_type;
179 static inline hashval_t hash (const comdat_entry *);
180 static inline bool equal (const comdat_entry *, const comdat_entry *);
181 static inline void remove (comdat_entry *);
185 comdat_entry_hasher::hash (const comdat_entry *entry)
187 return htab_hash_string (entry->sig);
191 comdat_entry_hasher::equal (const comdat_entry *entry1,
192 const comdat_entry *entry2)
194 return strcmp (entry1->sig, entry2->sig) == 0;
197 /* Hash table of group signature symbols. */
199 static hash_table<comdat_entry_hasher> *solaris_comdat_htab;
201 /* Output assembly to switch to COMDAT group section NAME with attributes
202 FLAGS and group signature symbol DECL, using Sun as syntax. */
205 solaris_elf_asm_comdat_section (const char *name, unsigned int flags, tree decl)
207 const char *signature;
209 comdat_entry entry, **slot;
211 if (TREE_CODE (decl) == IDENTIFIER_NODE)
212 signature = IDENTIFIER_POINTER (decl);
214 signature = IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl));
216 /* Sun as requires group sections to be fragmented, i.e. to have names of
217 the form <section>%<fragment>. Strictly speaking this is only
218 necessary to support cc -xF, but is enforced globally in violation of
219 the ELF gABI. We keep the section names generated by GCC (generally
220 of the form .text.<signature>) and append %<signature> to pacify as,
221 despite the redundancy. */
222 section = concat (name, "%", signature, NULL);
224 /* Clear SECTION_LINKONCE flag so targetm.asm_out.named_section only
225 emits this as a regular section. Emit section before .group
226 directive since Sun as treats undeclared sections as @progbits,
227 which conflicts with .bss* sections which are @nobits. */
228 targetm.asm_out.named_section (section, flags & ~SECTION_LINKONCE, decl);
230 /* Sun as separates declaration of a group section and of the group
231 itself, using the .group directive and the #comdat flag. */
232 fprintf (asm_out_file, "\t.group\t%s," SECTION_NAME_FORMAT ",#comdat\n",
235 /* Unlike GNU as, group signature symbols need to be defined explicitly
236 for Sun as. With a few exceptions, this is already the case. To
237 identify the missing ones without changing the affected frontents,
238 remember the signature symbols and emit those not marked
239 TREE_SYMBOL_REFERENCED in solaris_file_end. */
240 if (!solaris_comdat_htab)
241 solaris_comdat_htab = new hash_table<comdat_entry_hasher> (37);
243 entry.sig = signature;
244 slot = solaris_comdat_htab->find_slot (&entry, INSERT);
248 *slot = XCNEW (comdat_entry);
249 /* Remember fragmented section name. */
250 (*slot)->name = section;
251 /* Emit as regular section, .group declaration has already been done. */
252 (*slot)->flags = flags & ~SECTION_LINKONCE;
253 (*slot)->decl = decl;
254 (*slot)->sig = signature;
258 /* Define unreferenced COMDAT group signature symbol corresponding to SLOT. */
261 solaris_define_comdat_signature (comdat_entry **slot,
262 void *aux ATTRIBUTE_UNUSED)
264 comdat_entry *entry = *slot;
265 tree decl = entry->decl;
267 if (TREE_CODE (decl) != IDENTIFIER_NODE)
268 decl = DECL_COMDAT_GROUP (decl);
270 if (!TREE_SYMBOL_REFERENCED (decl))
272 /* Switch to group section, otherwise Sun as complains
273 `Group Id symbol defined outside of group'. */
274 switch_to_section (get_section (entry->name, entry->flags, entry->decl));
276 ASM_OUTPUT_LABEL (asm_out_file, entry->sig);
279 /* Continue with scan. */
283 /* Emit unreferenced COMDAT group signature symbols for Sun as. */
286 solaris_file_end (void)
288 if (!solaris_comdat_htab)
291 solaris_comdat_htab->traverse <void *, solaris_define_comdat_signature>
296 solaris_override_options (void)
298 /* Older versions of Solaris ld cannot handle CIE version 3 in .eh_frame.
299 Don't emit DWARF3/4 unless specifically selected if so. */
300 if (!HAVE_LD_EH_FRAME_CIEV3 && !global_options_set.x_dwarf_version)